A billion dollars is like a superyacht: not so easy to hide. But the billionaires who possess such treasure can and do go incognito: here are 9 ways to spot the superwealthy in their native habitats.

Sierra Tango

Sierra Tango

A plane is not subtle. Godzilla has a smaller carbon footprint. But you can still be unassuming about it. When you drive up to the airport gate, you don't say, "I'm going to that Gulfstream 650 over there with the interior designed by Zaha Hadid." You say, "Three-Five-Four Sierra Tango," identifying the plane by its tail number with the military efficiency of Burt Lancaster in From Here to Eternity.